-import EventEmitter from 'events'
-import type { IWorker } from './abstract-pool'
import type { IPool } from './pool'
+import type { IPoolWorker } from './pool-worker'
/**
- * Internal poolifier pool emitter.
+ * Internal pool types.
*/
-export class PoolEmitter extends EventEmitter {}
+export enum PoolType {
+ FIXED = 'fixed',
+ DYNAMIC = 'dynamic'
+}
+
+/**
+ * Internal tasks usage statistics.
+ */
+export interface TasksUsage {
+ run: number
+ running: number
+ runTime: number
+ avgRunTime: number
+}
+
+/**
+ * Internal worker type.
+ *
+ * @typeParam Worker - Type of worker which manages this pool.
+ */
+export interface WorkerType<Worker extends IPoolWorker> {
+ worker: Worker
+ tasksUsage: TasksUsage
+}
/**
* Internal contract definition for a poolifier pool.
*
- * @template Worker Type of worker which manages this pool.
- * @template Data Type of data sent to the worker.
- * @template Response Type of response of execution.
+ * @typeParam Worker - Type of worker which manages this pool.
+ * @typeParam Data - Type of data sent to the worker.
+ * @typeParam Response - Type of response of execution.
*/
export interface IPoolInternal<
- Worker extends IWorker,
+ Worker extends IPoolWorker,
Data = unknown,
Response = unknown
> extends IPool<Data, Response> {
/**
- * List of currently available workers.
+ * Pool workers map.
*/
- readonly workers: Worker[]
+ readonly workers: Map<number, WorkerType<Worker>>
/**
- * The tasks map.
+ * Pool type.
*
- * - `key`: The `Worker`
- * - `value`: Number of tasks currently in progress on the worker.
+ * If it is `'dynamic'`, it provides the `max` property.
*/
- readonly tasks: Map<Worker, number>
+ readonly type: PoolType
/**
- * Emitter on which events can be listened to.
- *
- * Events that can currently be listened to:
+ * Whether the pool is busy or not.
*
- * - `'busy'`
+ * The pool busyness boolean status.
+ */
+ readonly busy: boolean
+
+ /**
+ * Number of tasks currently concurrently running.
*/
- readonly emitter: PoolEmitter
+ readonly numberOfRunningTasks: number
/**
- * Whether the pool is dynamic or not.
+ * Finds a free worker based on the number of tasks the worker has applied.
+ *
+ * If a worker is found with `0` running tasks, it is detected as free and returned.
*
- * If it is dynamic, it provides the `max` property.
+ * If no free worker is found, `false` is returned.
+ *
+ * @returns A free worker if there is one, otherwise `false`.
*/
- readonly dynamic: boolean
+ findFreeWorker: () => Worker | false
/**
- * Maximum number of workers that can be created by this pool.
+ * Gets worker tasks usage.
+ *
+ * @param worker - The worker.
+ * @returns The tasks usage on the worker.
*/
- readonly max?: number
+ getWorkerTasksUsage: (worker: Worker) => TasksUsage | undefined
}